Commit | Line | Data |
---|---|---|
8ae0e4b4 | 1 | /* |
0ebd7d37 | 2 | * Copyright (c) 1982, 1986, 1988 Regents of the University of California. |
2b6b6284 | 3 | * All rights reserved. |
8ae0e4b4 | 4 | * |
dbf0c423 | 5 | * %sccs.include.redist.c% |
2b6b6284 | 6 | * |
af58179c | 7 | * @(#)ip_icmp.c 7.15 (Berkeley) %G% |
8ae0e4b4 | 8 | */ |
81a36a8d | 9 | |
20666ad3 JB |
10 | #include "param.h" |
11 | #include "systm.h" | |
9d91b170 | 12 | #include "malloc.h" |
20666ad3 JB |
13 | #include "mbuf.h" |
14 | #include "protosw.h" | |
15 | #include "socket.h" | |
16 | #include "time.h" | |
17 | #include "kernel.h" | |
6e7edb25 BJ |
18 | |
19 | #include "../net/route.h" | |
c175a1bd | 20 | #include "../net/if.h" |
f4d55810 | 21 | |
20666ad3 JB |
22 | #include "in.h" |
23 | #include "in_systm.h" | |
c175a1bd | 24 | #include "in_var.h" |
20666ad3 JB |
25 | #include "ip.h" |
26 | #include "ip_icmp.h" | |
27 | #include "icmp_var.h" | |
81a36a8d BJ |
28 | |
29 | /* | |
30 | * ICMP routines: error generation, receive packet processing, and | |
31 | * routines to turnaround packets back to the originator, and | |
32 | * host table maintenance routines. | |
33 | */ | |
7a372964 | 34 | #ifdef ICMPPRINTFS |
67387c9c | 35 | int icmpprintfs = 0; |
a60889ab | 36 | #endif |
81a36a8d | 37 | |
af58179c MK |
38 | extern struct protosw inetsw[]; |
39 | ||
81a36a8d | 40 | /* |
72e4f44e SL |
41 | * Generate an error packet of type error |
42 | * in response to bad packet ip. | |
81a36a8d | 43 | */ |
9d91b170 MK |
44 | /*VARARGS3*/ |
45 | icmp_error(n, type, code, dest) | |
46 | struct mbuf *n; | |
755d8841 | 47 | int type, code; |
f22d98c3 | 48 | struct in_addr dest; |
81a36a8d | 49 | { |
9d91b170 | 50 | register struct ip *oip = mtod(n, struct ip *), *nip; |
72e4f44e SL |
51 | register unsigned oiplen = oip->ip_hl << 2; |
52 | register struct icmp *icp; | |
9d91b170 | 53 | register struct mbuf *m; |
8011f5df | 54 | unsigned icmplen; |
81a36a8d | 55 | |
a60889ab | 56 | #ifdef ICMPPRINTFS |
39674d5f SL |
57 | if (icmpprintfs) |
58 | printf("icmp_error(%x, %d, %d)\n", oip, type, code); | |
a60889ab | 59 | #endif |
cd86d39a MK |
60 | if (type != ICMP_REDIRECT) |
61 | icmpstat.icps_error++; | |
81a36a8d | 62 | /* |
f22d98c3 | 63 | * Don't send error if not the first fragment of message. |
99fca325 MK |
64 | * Don't error if the old packet protocol was ICMP |
65 | * error message, only known informational types. | |
81a36a8d | 66 | */ |
f22d98c3 | 67 | if (oip->ip_off &~ (IP_MF|IP_DF)) |
b4dc7708 | 68 | goto freeit; |
99fca325 | 69 | if (oip->ip_p == IPPROTO_ICMP && type != ICMP_REDIRECT && |
0ebd7d37 | 70 | dtom(oip)->m_len >= oiplen + ICMP_MINLEN && |
9a63a2be | 71 | n->m_len >= oiplen + ICMP_MINLEN && |
99fca325 | 72 | !ICMP_INFOTYPE(((struct icmp *)((caddr_t)oip + oiplen))->icmp_type)) { |
7b66c1fd | 73 | icmpstat.icps_oldicmp++; |
b4dc7708 | 74 | goto freeit; |
7b66c1fd | 75 | } |
81a36a8d BJ |
76 | |
77 | /* | |
72e4f44e | 78 | * First, formulate icmp message |
81a36a8d | 79 | */ |
9d91b170 | 80 | m = m_gethdr(M_DONTWAIT, MT_HEADER); |
7b66c1fd | 81 | if (m == NULL) |
b4dc7708 | 82 | goto freeit; |
9d91b170 | 83 | icmplen = oiplen + min(8, oip->ip_len); |
f22d98c3 | 84 | m->m_len = icmplen + ICMP_MINLEN; |
9d91b170 | 85 | MH_ALIGN(m, m->m_len); |
72e4f44e | 86 | icp = mtod(m, struct icmp *); |
f22d98c3 | 87 | if ((u_int)type > ICMP_MAXTYPE) |
7b66c1fd SL |
88 | panic("icmp_error"); |
89 | icmpstat.icps_outhist[type]++; | |
81a36a8d | 90 | icp->icmp_type = type; |
f22d98c3 MK |
91 | if (type == ICMP_REDIRECT) |
92 | icp->icmp_gwaddr = dest; | |
93 | else | |
94 | icp->icmp_void = 0; | |
81a36a8d | 95 | if (type == ICMP_PARAMPROB) { |
81a36a8d | 96 | icp->icmp_pptr = code; |
72e4f44e SL |
97 | code = 0; |
98 | } | |
99 | icp->icmp_code = code; | |
f22d98c3 | 100 | bcopy((caddr_t)oip, (caddr_t)&icp->icmp_ip, icmplen); |
39674d5f | 101 | nip = &icp->icmp_ip; |
9d91b170 | 102 | nip->ip_len = htons((u_short)(nip->ip_len + oiplen)); |
81a36a8d BJ |
103 | |
104 | /* | |
9a63a2be MK |
105 | * Now, copy old ip header (without options) |
106 | * in front of icmp message. | |
81a36a8d | 107 | */ |
9a63a2be | 108 | if (m->m_data - sizeof(struct ip) < m->m_pktdat) |
f22d98c3 | 109 | panic("icmp len"); |
9a63a2be MK |
110 | m->m_data -= sizeof(struct ip); |
111 | m->m_len += sizeof(struct ip); | |
9d91b170 MK |
112 | m->m_pkthdr.len = m->m_len; |
113 | m->m_pkthdr.rcvif = n->m_pkthdr.rcvif; | |
72e4f44e SL |
114 | nip = mtod(m, struct ip *); |
115 | bcopy((caddr_t)oip, (caddr_t)nip, oiplen); | |
76a1d7bb | 116 | nip->ip_len = m->m_len; |
9a63a2be | 117 | nip->ip_hl = sizeof(struct ip) >> 2; |
0ebd7d37 | 118 | nip->ip_hl = sizeof(struct ip) >> 2; |
72e4f44e | 119 | nip->ip_p = IPPROTO_ICMP; |
9d91b170 | 120 | icmp_reflect(m); |
81a36a8d | 121 | |
b4dc7708 | 122 | freeit: |
9d91b170 | 123 | m_freem(n); |
81a36a8d BJ |
124 | } |
125 | ||
72e4f44e | 126 | static struct sockproto icmproto = { AF_INET, IPPROTO_ICMP }; |
9a63a2be MK |
127 | static struct sockaddr_in icmpsrc = { sizeof (struct sockaddr_in), AF_INET }; |
128 | static struct sockaddr_in icmpdst = { sizeof (struct sockaddr_in), AF_INET }; | |
129 | static struct sockaddr_in icmpgw = { sizeof (struct sockaddr_in), AF_INET }; | |
130 | struct sockaddr_in icmpmask = { 8, 0 }; | |
f22d98c3 | 131 | struct in_ifaddr *ifptoia(); |
72e4f44e | 132 | |
81a36a8d | 133 | /* |
d52566dd | 134 | * Process a received ICMP message. |
81a36a8d | 135 | */ |
9d91b170 | 136 | icmp_input(m, hlen) |
166e6158 | 137 | register struct mbuf *m; |
9d91b170 | 138 | int hlen; |
81a36a8d | 139 | { |
81a36a8d | 140 | register struct icmp *icp; |
d52566dd | 141 | register struct ip *ip = mtod(m, struct ip *); |
9d91b170 | 142 | int icmplen = ip->ip_len; |
8046f415 | 143 | register int i; |
f22d98c3 | 144 | struct in_ifaddr *ia; |
8046f415 | 145 | int (*ctlfunc)(), code; |
b454c3ea | 146 | extern u_char ip_protox[]; |
c175a1bd | 147 | extern struct in_addr in_makeaddr(); |
81a36a8d BJ |
148 | |
149 | /* | |
150 | * Locate icmp structure in mbuf, and check | |
151 | * that not corrupted and of at least minimum length. | |
152 | */ | |
a60889ab | 153 | #ifdef ICMPPRINTFS |
39674d5f SL |
154 | if (icmpprintfs) |
155 | printf("icmp_input from %x, len %d\n", ip->ip_src, icmplen); | |
a60889ab | 156 | #endif |
4d75f980 | 157 | if (icmplen < ICMP_MINLEN) { |
7b66c1fd | 158 | icmpstat.icps_tooshort++; |
b4dc7708 | 159 | goto freeit; |
7b66c1fd | 160 | } |
f22d98c3 | 161 | i = hlen + MIN(icmplen, ICMP_ADVLENMIN); |
9d91b170 | 162 | if (m->m_len < i && (m = m_pullup(m, i)) == 0) { |
167351c2 MK |
163 | icmpstat.icps_tooshort++; |
164 | return; | |
165 | } | |
8046f415 | 166 | ip = mtod(m, struct ip *); |
81a36a8d | 167 | m->m_len -= hlen; |
9d91b170 | 168 | m->m_data += hlen; |
72e4f44e | 169 | icp = mtod(m, struct icmp *); |
8046f415 | 170 | if (in_cksum(m, icmplen)) { |
7b66c1fd | 171 | icmpstat.icps_checksum++; |
b4dc7708 | 172 | goto freeit; |
72e4f44e | 173 | } |
76a1d7bb | 174 | m->m_len += hlen; |
9d91b170 | 175 | m->m_data -= hlen; |
81a36a8d | 176 | |
a60889ab | 177 | #ifdef ICMPPRINTFS |
81a36a8d BJ |
178 | /* |
179 | * Message type specific processing. | |
180 | */ | |
39674d5f SL |
181 | if (icmpprintfs) |
182 | printf("icmp_input, type %d code %d\n", icp->icmp_type, | |
a60889ab KM |
183 | icp->icmp_code); |
184 | #endif | |
f22d98c3 | 185 | if (icp->icmp_type > ICMP_MAXTYPE) |
166e6158 | 186 | goto raw; |
7b66c1fd | 187 | icmpstat.icps_inhist[icp->icmp_type]++; |
a60889ab | 188 | code = icp->icmp_code; |
7b66c1fd | 189 | switch (icp->icmp_type) { |
81a36a8d BJ |
190 | |
191 | case ICMP_UNREACH: | |
a60889ab KM |
192 | if (code > 5) |
193 | goto badcode; | |
194 | code += PRC_UNREACH_NET; | |
195 | goto deliver; | |
196 | ||
81a36a8d | 197 | case ICMP_TIMXCEED: |
a60889ab KM |
198 | if (code > 1) |
199 | goto badcode; | |
200 | code += PRC_TIMXCEED_INTRANS; | |
201 | goto deliver; | |
202 | ||
81a36a8d | 203 | case ICMP_PARAMPROB: |
a60889ab KM |
204 | if (code) |
205 | goto badcode; | |
206 | code = PRC_PARAMPROB; | |
207 | goto deliver; | |
208 | ||
72e4f44e | 209 | case ICMP_SOURCEQUENCH: |
a60889ab KM |
210 | if (code) |
211 | goto badcode; | |
212 | code = PRC_QUENCH; | |
213 | deliver: | |
81a36a8d | 214 | /* |
a60889ab | 215 | * Problem with datagram; advise higher level routines. |
81a36a8d | 216 | */ |
3953bf11 MK |
217 | if (icmplen < ICMP_ADVLENMIN || icmplen < ICMP_ADVLEN(icp) || |
218 | icp->icmp_ip.ip_hl < (sizeof(struct ip) >> 2)) { | |
7b66c1fd | 219 | icmpstat.icps_badlen++; |
b4dc7708 | 220 | goto freeit; |
7b66c1fd | 221 | } |
3953bf11 | 222 | NTOHS(icp->icmp_ip.ip_len); |
a60889ab | 223 | #ifdef ICMPPRINTFS |
39674d5f SL |
224 | if (icmpprintfs) |
225 | printf("deliver to protocol %d\n", icp->icmp_ip.ip_p); | |
a60889ab | 226 | #endif |
f22d98c3 | 227 | icmpsrc.sin_addr = icp->icmp_ip.ip_dst; |
59965020 | 228 | if (ctlfunc = inetsw[ip_protox[icp->icmp_ip.ip_p]].pr_ctlinput) |
3953bf11 MK |
229 | (*ctlfunc)(code, (struct sockaddr *)&icmpsrc, |
230 | (caddr_t) &icp->icmp_ip); | |
76a1d7bb | 231 | break; |
a60889ab KM |
232 | |
233 | badcode: | |
234 | icmpstat.icps_badcode++; | |
76a1d7bb | 235 | break; |
81a36a8d BJ |
236 | |
237 | case ICMP_ECHO: | |
238 | icp->icmp_type = ICMP_ECHOREPLY; | |
239 | goto reflect; | |
240 | ||
241 | case ICMP_TSTAMP: | |
7b66c1fd SL |
242 | if (icmplen < ICMP_TSLEN) { |
243 | icmpstat.icps_badlen++; | |
76a1d7bb | 244 | break; |
7b66c1fd | 245 | } |
81a36a8d | 246 | icp->icmp_type = ICMP_TSTAMPREPLY; |
2b4b57cd | 247 | icp->icmp_rtime = iptime(); |
81a36a8d BJ |
248 | icp->icmp_ttime = icp->icmp_rtime; /* bogus, do later! */ |
249 | goto reflect; | |
250 | ||
251 | case ICMP_IREQ: | |
c175a1bd | 252 | #define satosin(sa) ((struct sockaddr_in *)(sa)) |
9d91b170 MK |
253 | if (in_netof(ip->ip_src) == 0 && |
254 | (ia = ifptoia(m->m_pkthdr.rcvif))) | |
f22d98c3 | 255 | ip->ip_src = in_makeaddr(in_netof(IA_SIN(ia)->sin_addr), |
c175a1bd MK |
256 | in_lnaof(ip->ip_src)); |
257 | icp->icmp_type = ICMP_IREQREPLY; | |
81a36a8d BJ |
258 | goto reflect; |
259 | ||
f22d98c3 | 260 | case ICMP_MASKREQ: |
9d91b170 MK |
261 | if (icmplen < ICMP_MASKLEN || |
262 | (ia = ifptoia(m->m_pkthdr.rcvif)) == 0) | |
76a1d7bb | 263 | break; |
9b8941dc | 264 | icp->icmp_type = ICMP_MASKREPLY; |
9a63a2be | 265 | icp->icmp_mask = ia->ia_sockmask.sin_addr.s_addr; |
f22d98c3 MK |
266 | if (ip->ip_src.s_addr == 0) { |
267 | if (ia->ia_ifp->if_flags & IFF_BROADCAST) | |
268 | ip->ip_src = satosin(&ia->ia_broadaddr)->sin_addr; | |
269 | else if (ia->ia_ifp->if_flags & IFF_POINTOPOINT) | |
270 | ip->ip_src = satosin(&ia->ia_dstaddr)->sin_addr; | |
271 | } | |
76a1d7bb MK |
272 | reflect: |
273 | ip->ip_len += hlen; /* since ip_input deducts this */ | |
274 | icmpstat.icps_reflect++; | |
275 | icmpstat.icps_outhist[icp->icmp_type]++; | |
9d91b170 | 276 | icmp_reflect(m); |
76a1d7bb | 277 | return; |
f22d98c3 | 278 | |
a469458a | 279 | case ICMP_REDIRECT: |
7b66c1fd SL |
280 | if (icmplen < ICMP_ADVLENMIN || icmplen < ICMP_ADVLEN(icp)) { |
281 | icmpstat.icps_badlen++; | |
76a1d7bb | 282 | break; |
7b66c1fd | 283 | } |
a469458a SL |
284 | /* |
285 | * Short circuit routing redirects to force | |
286 | * immediate change in the kernel's routing | |
287 | * tables. The message is also handed to anyone | |
288 | * listening on a raw socket (e.g. the routing | |
fbc81152 | 289 | * daemon for use in updating its tables). |
a469458a | 290 | */ |
f22d98c3 | 291 | icmpgw.sin_addr = ip->ip_src; |
167351c2 | 292 | icmpdst.sin_addr = icp->icmp_gwaddr; |
f22d98c3 MK |
293 | #ifdef ICMPPRINTFS |
294 | if (icmpprintfs) | |
295 | printf("redirect dst %x to %x\n", icp->icmp_ip.ip_dst, | |
296 | icp->icmp_gwaddr); | |
297 | #endif | |
fbc81152 | 298 | if (code == ICMP_REDIRECT_NET || code == ICMP_REDIRECT_TOSNET) { |
9a63a2be | 299 | u_long in_netof(); |
fbc81152 | 300 | icmpsrc.sin_addr = |
c175a1bd | 301 | in_makeaddr(in_netof(icp->icmp_ip.ip_dst), INADDR_ANY); |
7a372964 | 302 | in_sockmaskof(icp->icmp_ip.ip_dst, &icmpmask); |
fbc81152 | 303 | rtredirect((struct sockaddr *)&icmpsrc, |
9a63a2be MK |
304 | (struct sockaddr *)&icmpdst, |
305 | (struct sockaddr *)&icmpmask, RTF_GATEWAY, | |
b4dc7708 | 306 | (struct sockaddr *)&icmpgw, (struct rtentry **)0); |
166e6158 | 307 | icmpsrc.sin_addr = icp->icmp_ip.ip_dst; |
f22d98c3 MK |
308 | pfctlinput(PRC_REDIRECT_NET, |
309 | (struct sockaddr *)&icmpsrc); | |
fbc81152 MK |
310 | } else { |
311 | icmpsrc.sin_addr = icp->icmp_ip.ip_dst; | |
312 | rtredirect((struct sockaddr *)&icmpsrc, | |
9a63a2be MK |
313 | (struct sockaddr *)&icmpdst, |
314 | (struct sockaddr *)0, RTF_GATEWAY | RTF_HOST, | |
b4dc7708 | 315 | (struct sockaddr *)&icmpgw, (struct rtentry **)0); |
f22d98c3 MK |
316 | pfctlinput(PRC_REDIRECT_HOST, |
317 | (struct sockaddr *)&icmpsrc); | |
fbc81152 | 318 | } |
76a1d7bb | 319 | break; |
167351c2 | 320 | |
76a1d7bb MK |
321 | /* |
322 | * No kernel processing for the following; | |
323 | * just fall through to send to raw listener. | |
324 | */ | |
167351c2 MK |
325 | case ICMP_ECHOREPLY: |
326 | case ICMP_TSTAMPREPLY: | |
327 | case ICMP_IREQREPLY: | |
f22d98c3 | 328 | case ICMP_MASKREPLY: |
81a36a8d | 329 | default: |
76a1d7bb | 330 | break; |
81a36a8d | 331 | } |
76a1d7bb | 332 | |
166e6158 | 333 | raw: |
76a1d7bb MK |
334 | icmpsrc.sin_addr = ip->ip_src; |
335 | icmpdst.sin_addr = ip->ip_dst; | |
3953bf11 | 336 | (void) raw_input(m, &icmproto, (struct sockaddr *)&icmpsrc, |
76a1d7bb | 337 | (struct sockaddr *)&icmpdst); |
af8f6a21 | 338 | return; |
76a1d7bb | 339 | |
b4dc7708 | 340 | freeit: |
76a1d7bb | 341 | m_freem(m); |
81a36a8d BJ |
342 | } |
343 | ||
344 | /* | |
345 | * Reflect the ip packet back to the source | |
346 | */ | |
9d91b170 MK |
347 | icmp_reflect(m) |
348 | struct mbuf *m; | |
81a36a8d | 349 | { |
9d91b170 | 350 | register struct ip *ip = mtod(m, struct ip *); |
c175a1bd | 351 | register struct in_ifaddr *ia; |
f22d98c3 | 352 | struct in_addr t; |
5ba846a2 | 353 | struct mbuf *opts = 0, *ip_srcroute(); |
76a1d7bb | 354 | int optlen = (ip->ip_hl << 2) - sizeof(struct ip); |
81a36a8d | 355 | |
72e4f44e SL |
356 | t = ip->ip_dst; |
357 | ip->ip_dst = ip->ip_src; | |
f22d98c3 MK |
358 | /* |
359 | * If the incoming packet was addressed directly to us, | |
360 | * use dst as the src for the reply. Otherwise (broadcast | |
361 | * or anonymous), use the address which corresponds | |
362 | * to the incoming interface. | |
363 | */ | |
364 | for (ia = in_ifaddr; ia; ia = ia->ia_next) { | |
365 | if (t.s_addr == IA_SIN(ia)->sin_addr.s_addr) | |
366 | break; | |
367 | if ((ia->ia_ifp->if_flags & IFF_BROADCAST) && | |
368 | t.s_addr == satosin(&ia->ia_broadaddr)->sin_addr.s_addr) | |
369 | break; | |
370 | } | |
371 | if (ia == (struct in_ifaddr *)0) | |
9d91b170 | 372 | ia = ifptoia(m->m_pkthdr.rcvif); |
76751082 MK |
373 | if (ia == (struct in_ifaddr *)0) |
374 | ia = in_ifaddr; | |
375 | t = IA_SIN(ia)->sin_addr; | |
72e4f44e | 376 | ip->ip_src = t; |
2bc7b126 | 377 | ip->ip_ttl = MAXTTL; |
f22d98c3 | 378 | |
76a1d7bb | 379 | if (optlen > 0) { |
9a63a2be | 380 | register u_char *cp; |
89369b13 | 381 | struct mbuf *m = dtom(ip); |
9a63a2be MK |
382 | int opt, cnt, off; |
383 | u_int len; | |
384 | ||
0ebd7d37 | 385 | register u_char *cp; |
b4dc7708 | 386 | int opt, cnt; |
0ebd7d37 MK |
387 | u_int len; |
388 | ||
cd86d39a | 389 | /* |
9a63a2be MK |
390 | * Retrieve any source routing from the incoming packet; |
391 | * add on any record-route or timestamp options. | |
cd86d39a | 392 | */ |
9a63a2be | 393 | cp = (u_char *) (ip + 1); |
7a372964 MK |
394 | if ((opts = ip_srcroute()) == 0 && |
395 | (opts = m_gethdr(M_DONTWAIT, MT_HEADER))) { | |
396 | opts->m_len = sizeof(struct in_addr); | |
397 | mtod(opts, struct in_addr *)->s_addr = 0; | |
398 | } | |
399 | if (opts) { | |
400 | #ifdef ICMPPRINTFS | |
401 | if (icmpprintfs) | |
402 | printf("icmp_reflect optlen %d rt %d => ", | |
403 | optlen, opts->m_len); | |
404 | #endif | |
9a63a2be | 405 | for (cnt = optlen; cnt > 0; cnt -= len, cp += len) { |
7a372964 MK |
406 | opt = cp[IPOPT_OPTVAL]; |
407 | if (opt == IPOPT_EOL) | |
408 | break; | |
409 | if (opt == IPOPT_NOP) | |
410 | len = 1; | |
411 | else { | |
412 | len = cp[IPOPT_OLEN]; | |
413 | if (len <= 0 || len > cnt) | |
414 | break; | |
415 | } | |
416 | /* | |
417 | * should check for overflow, but it "can't happen" | |
418 | */ | |
419 | if (opt == IPOPT_RR || opt == IPOPT_TS) { | |
420 | bcopy((caddr_t)cp, | |
421 | mtod(opts, caddr_t) + opts->m_len, len); | |
422 | opts->m_len += len; | |
423 | } | |
424 | } | |
425 | if (opts->m_len % 4 != 0) { | |
426 | *(mtod(opts, caddr_t) + opts->m_len) = IPOPT_EOL; | |
427 | opts->m_len++; | |
428 | } | |
429 | #ifdef ICMPPRINTFS | |
430 | if (icmpprintfs) | |
431 | printf("%d\n", opts->m_len); | |
432 | #endif | |
9a63a2be | 433 | } |
7a372964 MK |
434 | /* |
435 | * Now strip out original options by copying rest of first | |
436 | * mbuf's data back, and adjust the IP length. | |
437 | */ | |
9a63a2be MK |
438 | ip->ip_len -= optlen; |
439 | ip->ip_hl = sizeof(struct ip) >> 2; | |
7a372964 | 440 | m->m_len -= optlen; |
9d91b170 MK |
441 | if (m->m_flags & M_PKTHDR) |
442 | m->m_pkthdr.len -= optlen; | |
7a372964 MK |
443 | optlen += sizeof(struct ip); |
444 | bcopy((caddr_t)ip + optlen, (caddr_t)(ip + 1), | |
b4dc7708 | 445 | (unsigned)(m->m_len - sizeof(struct ip))); |
f22d98c3 | 446 | } |
424b2707 | 447 | |
9d91b170 | 448 | icmp_send(m, opts); |
cd86d39a | 449 | if (opts) |
8011f5df | 450 | (void)m_free(opts); |
81a36a8d BJ |
451 | } |
452 | ||
f22d98c3 MK |
453 | struct in_ifaddr * |
454 | ifptoia(ifp) | |
455 | struct ifnet *ifp; | |
456 | { | |
457 | register struct in_ifaddr *ia; | |
458 | ||
459 | for (ia = in_ifaddr; ia; ia = ia->ia_next) | |
460 | if (ia->ia_ifp == ifp) | |
461 | return (ia); | |
462 | return ((struct in_ifaddr *)0); | |
463 | } | |
464 | ||
81a36a8d | 465 | /* |
72e4f44e SL |
466 | * Send an icmp packet back to the ip level, |
467 | * after supplying a checksum. | |
81a36a8d | 468 | */ |
9d91b170 MK |
469 | icmp_send(m, opts) |
470 | register struct mbuf *m; | |
cd86d39a | 471 | struct mbuf *opts; |
81a36a8d | 472 | { |
9d91b170 | 473 | register struct ip *ip = mtod(m, struct ip *); |
af8f6a21 | 474 | register int hlen; |
72e4f44e | 475 | register struct icmp *icp; |
d52566dd | 476 | |
af8f6a21 | 477 | hlen = ip->ip_hl << 2; |
9d91b170 | 478 | m->m_data += hlen; |
76a1d7bb | 479 | m->m_len -= hlen; |
72e4f44e SL |
480 | icp = mtod(m, struct icmp *); |
481 | icp->icmp_cksum = 0; | |
482 | icp->icmp_cksum = in_cksum(m, ip->ip_len - hlen); | |
9d91b170 | 483 | m->m_data -= hlen; |
72e4f44e | 484 | m->m_len += hlen; |
a60889ab | 485 | #ifdef ICMPPRINTFS |
39674d5f SL |
486 | if (icmpprintfs) |
487 | printf("icmp_send dst %x src %x\n", ip->ip_dst, ip->ip_src); | |
a60889ab | 488 | #endif |
cd86d39a | 489 | (void) ip_output(m, opts, (struct route *)0, 0); |
d52566dd BJ |
490 | } |
491 | ||
cdad2eb1 | 492 | n_time |
2b4b57cd | 493 | iptime() |
d52566dd | 494 | { |
b3f3ec92 | 495 | struct timeval atv; |
2752c877 | 496 | u_long t; |
d52566dd | 497 | |
b3f3ec92 MK |
498 | microtime(&atv); |
499 | t = (atv.tv_sec % (24*60*60)) * 1000 + atv.tv_usec / 1000; | |
cdad2eb1 | 500 | return (htonl(t)); |
d52566dd | 501 | } |